1 /*
2 * QEMU Crypto hash algorithms
3 *
4 * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
5 * Copyright (c) 2016 Red Hat, Inc.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19 *
20 */
21
22 #include "qemu/osdep.h"
23 #include "qapi/error.h"
24 #include "crypto/hash.h"
25 #include "hashpriv.h"
26
27
28 static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALGO__MAX] = {
29 [QCRYPTO_HASH_ALGO_MD5] = G_CHECKSUM_MD5,
30 [QCRYPTO_HASH_ALGO_SHA1] = G_CHECKSUM_SHA1,
31 [QCRYPTO_HASH_ALGO_SHA224] = -1,
32 [QCRYPTO_HASH_ALGO_SHA256] = G_CHECKSUM_SHA256,
33 [QCRYPTO_HASH_ALGO_SHA384] = G_CHECKSUM_SHA384,
34 [QCRYPTO_HASH_ALGO_SHA512] = G_CHECKSUM_SHA512,
35 [QCRYPTO_HASH_ALGO_RIPEMD160] = -1,
36 };
37
qcrypto_hash_supports(QCryptoHashAlgo alg)38 gboolean qcrypto_hash_supports(QCryptoHashAlgo alg)
39 {
40 if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
41 qcrypto_hash_alg_map[alg] != -1) {
42 return true;
43 }
44 return false;
45 }
46
47 static
qcrypto_glib_hash_new(QCryptoHashAlgo alg,Error ** errp)48 QCryptoHash *qcrypto_glib_hash_new(QCryptoHashAlgo alg,
49 Error **errp)
50 {
51 QCryptoHash *hash;
52
53 hash = g_new(QCryptoHash, 1);
54 hash->alg = alg;
55 hash->opaque = g_checksum_new(qcrypto_hash_alg_map[alg]);
56
57 return hash;
58 }
59
60 static
qcrypto_glib_hash_free(QCryptoHash * hash)61 void qcrypto_glib_hash_free(QCryptoHash *hash)
62 {
63 if (hash->opaque) {
64 g_checksum_free(hash->opaque);
65 }
66
67 g_free(hash);
68 }
69
70
71 static
qcrypto_glib_hash_update(QCryptoHash * hash,const struct iovec * iov,size_t niov,Error ** errp)72 int qcrypto_glib_hash_update(QCryptoHash *hash,
73 const struct iovec *iov,
74 size_t niov,
75 Error **errp)
76 {
77 GChecksum *ctx = hash->opaque;
78
79 for (int i = 0; i < niov; i++) {
80 g_checksum_update(ctx, iov[i].iov_base, iov[i].iov_len);
81 }
82
83 return 0;
84 }
85
86 static
qcrypto_glib_hash_finalize(QCryptoHash * hash,uint8_t ** result,size_t * result_len,Error ** errp)87 int qcrypto_glib_hash_finalize(QCryptoHash *hash,
88 uint8_t **result,
89 size_t *result_len,
90 Error **errp)
91 {
92 int ret;
93 GChecksum *ctx = hash->opaque;
94
95 ret = g_checksum_type_get_length(qcrypto_hash_alg_map[hash->alg]);
96 if (ret < 0) {
97 error_setg(errp, "Unable to get hash length");
98 *result_len = 0;
99 return -1;
100 }
101
102 if (*result_len == 0) {
103 *result_len = ret;
104 *result = g_new(uint8_t, *result_len);
105 } else if (*result_len != ret) {
106 error_setg(errp,
107 "Result buffer size %zu is smaller than hash %d",
108 *result_len, ret);
109 return -1;
110 }
111
112 g_checksum_get_digest(ctx, *result, result_len);
113 return 0;
114 }
115
116 QCryptoHashDriver qcrypto_hash_lib_driver = {
117 .hash_new = qcrypto_glib_hash_new,
118 .hash_update = qcrypto_glib_hash_update,
119 .hash_finalize = qcrypto_glib_hash_finalize,
120 .hash_free = qcrypto_glib_hash_free,
121 };
122